| (19) |
 |
|
(11) |
EP 1 674 148 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
04.03.2009 Bulletin 2009/10 |
| (43) |
Date of publication A2: |
|
28.06.2006 Bulletin 2006/26 |
| (22) |
Date of filing: 22.12.2005 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE
SI SK TR |
|
Designated Extension States: |
|
AL BA HR MK YU |
| (30) |
Priority: |
27.12.2004 JP 2004377850
|
| (71) |
Applicant: Cataler Corporation |
|
Shizuoka-ken
437-1492 (JP) |
|
| (72) |
Inventors: |
|
- Taki, Kenichi
c/o Cataler Corporation
Shizuoka-ken, 437-1492 (JP)
- Hirai, Akimasa
c/o Cataler Corporation
Shizuoka-ken, 437-1492 (JP)
- Suzuki, Hiromasa
c/o Cataler Corporation
Shizuoka-ken, 437-1492 (JP)
|
| (74) |
Representative: Lorenz, Werner |
|
Lorenz & Kollegen
Patent- und Rechtsanwaltskanzlei
Alte Ulmer Strasse 2
89522 Heidenheim
89522 Heidenheim (DE) |
|
| |
|
| (54) |
Exhaust gas purifying catalyst |
(57) An exhaust gas purifying catalyst comprises a substrate having a through hole serving
as a passage for exhaust gas; and a catalyst coating layer formed on an internal surface
of the through hole. The catalyst coating layer contains: a component (i): a precious
metal; and a component (ii): at least one of a Zr oxide, a Ce oxide and a ZrCe mixed
oxide. On an upstream portion of the passage, an oxide equivalent weight of Zr is
within a range of 51-100 wt% of an oxide equivalent weight of Zr and Ce contained
in the component (ii). On a downstream portion of the passage, the component (ii)
includes at least one of a Ce oxide and a ZrCe mixed oxide in which an oxide equivalent
weight of Ce is within a range of 58ยท100 wt% of an oxide equivalent weight of Zr and
Ce contained in the ZrCe mixed oxide.